blob: e504047f3fb97fc3880ce2d63816999fc0bce7a6 (
plain) (
tree)
|
|
package dotty.tools.backend.jvm
import dotty.tools.dotc.ast.tpd
import dotty.tools.dotc.ast.Trees._
import dotty.tools.dotc.core.Contexts.Context
import dotty.tools.dotc.core.Symbols._
import dotty.tools.dotc.transform.TreeTransforms.{MiniPhaseTransform, TransformerInfo}
/** Collect all super calls except to the parent class.
*
* This information is used to know if it is safe to remove a redundant mixin class.
* A redundant mixin class is one that is implemented by another mixin class. As the
* methods in a redundant mixin class could be implemented with a default abstract method,
* the redundant mixin class could be required as a parent by the JVM.
*/
class CollectSuperCalls extends MiniPhaseTransform {
import tpd._
def phaseName: String = "collectSuperCalls"
override def transformSelect(tree: Select)(implicit ctx: Context, info: TransformerInfo): Tree = {
tree.qualifier match {
case Super(qual, mix) if mix.nonEmpty =>
val classSymbol: ClassSymbol = qual match {
case qual: This => qual.symbol.asClass.classSymbol
case qual => qual.symbol.info.classSymbol.asClass
}
registerSuperCall(classSymbol, tree.symbol.owner.asClass)
case _ =>
}
tree
}
private def registerSuperCall(sym: ClassSymbol, calls: ClassSymbol)(implicit ctx: Context) = {
ctx.genBCodePhase match {
case genBCodePhase: GenBCode =>
genBCodePhase.registerSuperCall(sym, calls)
case _ =>
}
}
}
|